ferrule Meaning, Definition & Usage

  1. noun a metal cap or band placed on a wooden pole to prevent splitting
    collet.

WordNet

Fer"rule noun
Etymology
Formerly verrel, F. virole, fr. L. viriola little bracelet, dim. of viriae, pl., bracelets; prob. akin to viere to twist, weave, and E. withe. The spelling with f is due to confusion with L. ferrum iron.
Definitions
  1. A ring or cap of metal put round a cane, tool, handle, or other similar object, to strengthen it, or prevent splitting and wearing.
  2. (Steam Boilers) A bushing for expanding the end of a flue to fasten it tightly in the tube plate, or for partly filling up its mouth.

Webster 1913